Some Homological Algebra
We collect here for ease of reference some terminology and results concerning chain complexes. Much of this will be well-known to anyone who has studied algebraic topology. The reader is advised to skip this section (or skim it lightly) and refer back to it as necessary. We will omit some of the proofs; these are either easy or else can be found in standard texts, such as Dold , Spanier , or MacLane .
KeywordsAbelian Group Exact Sequence Chain Complex Projective Module Free Resolution
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